Now that Sgt. Pepper's is out on DLC, how do I get my free songs from GameStop?

I entered my codes when I got the game for three songs off of the Sgt. Pepper album, now that it is out how do I go about redeeming them? I haven't received an email from GameStop or anything. I want to get home today after work and download them and I obviously do not want to pay as they should be free. Any help would be appreciated.